Resumo
Avian pathogenic Escherichia coli (APEC) isolated from avian cellulitis lesions produces a toxin, named Escherichia coli vacuolating factor (ECVF), that causes cell vacuolization and induces inflammatory response in broiler chicken. Methods We investigated the intracellular activities of ECVF in avian fibroblasts using fluorescence staining, electron microscopy, MTT and LDH measurements. As ECVF act specifically in avian cells, we performed blotting assay followed by mass spectrometry to better understand its initial intracellular protein recognition. Results ECVF induced actin contraction, mitochondrial damage and membrane permeability alterations. Ultrastructural analysis showed intracellular alterations, as nuclear lobulation and the presence of degraded structures inside the vacuoles. Moreover, ECVF induced cell death in fibroblasts. ECVF-biotin associates to at least two proteins only in avian cell lysates: alpha-actinin 4 and vinculin, both involved in cytoskeleton structure. Conclusion These findings demonstrated that ECVF plays an important role in avian cellulitis, markedly in initial steps of infection. Taken together, the results place this toxin as a target for drug and/or vaccine development, instead of the use of large amounts antibiotics.(AU)
Assuntos
Animais , Vacúolos , Citoesqueleto de Actina , Galinhas , Actinas , Escherichia coli , Fibroblastos , Celulite (Flegmão)Resumo
Avian pathogenic Escherichia coli (APEC) isolated from avian cellulitis lesions produces a toxin, named Escherichia coli vacuolating factor (ECVF), that causes cell vacuolization and induces inflammatory response in broiler chicken. Methods We investigated the intracellular activities of ECVF in avian fibroblasts using fluorescence staining, electron microscopy, MTT and LDH measurements. As ECVF act specifically in avian cells, we performed blotting assay followed by mass spectrometry to better understand its initial intracellular protein recognition. Results ECVF induced actin contraction, mitochondrial damage and membrane permeability alterations. Ultrastructural analysis showed intracellular alterations, as nuclear lobulation and the presence of degraded structures inside the vacuoles. Moreover, ECVF induced cell death in fibroblasts. ECVF-biotin associates to at least two proteins only in avian cell lysates: alpha-actinin 4 and vinculin, both involved in cytoskeleton structure. Conclusion These findings demonstrated that ECVF plays an important role in avian cellulitis, markedly in initial steps of infection. Taken together, the results place this toxin as a target for drug and/or vaccine development, instead of the use of large amounts antibiotics.(AU)
Assuntos
Animais , Vacúolos , Citoesqueleto de Actina , Galinhas , Actinas , Escherichia coli , Fibroblastos , Celulite (Flegmão)Resumo
Coenzyme Q-10 (CoQ-10) is a cofactor for mitochondrial electron transport chain and may be an alternative to improve sperm quality of cryopreserved equine semen. This work aimed to improve stallion semen quality after freezing by adding CoQ-10 to the cryopreservation protocol. Seven saddle stallions were utilized. Each animal was submitted to five semen collections and freezing procedures. For cryopreservation, each ejaculate was divided in three treatments: 1) Botucrio® diluent (control); 2) 50 μmol CoQ-10 added to Botucrio® diluent; 3) 1 mmol CoQ-10 added to Botucrio® diluent. Semen batches were analyzed for sperm motility characteristics (CASA), plasma and acrosomal membranes integrity and mitochondrial membrane potential (by fluorescence probes propidium iodide, Hoechst 33342, FITC-PSA and JC-1, respectively), alterations in cytoskeletal actin (phalloidin-FITC) and mitochondrial function (diaminobenzidine; DAB). The 1 mmol CoQ-10 treatment presented higher (P<0.05) amount (66.8%) of sperm cells with fully stained midpiece (indicating high mitochondrial activity) and higher (P<0.05) amount (81.6%) of cells without actin reorganization to the post-acrosomal region compared to control group (60.8% and 76.0%, respectively). It was concluded that the addition of 1 mmol CoQ-10 to the freezing diluent was more effective in preserving mitochondria functionality and cytoskeleton of sperm cells submitted to cryopreservation process.(AU)
Assuntos
Animais , Masculino , Cavalos/genética , Ubiquinona/administração & dosagem , Dinâmica Mitocondrial , Criopreservação , Espermatozoides/química , ActinasResumo
Plants adjust their shoot growth to acclimate to changing environmental factors, such as to enhanced Ultraviolet-B (UV-B) radiation. However, people have ignored that plant roots can also respond to UV-B light. Here, we find the morphology curled wheat roots under UV-B radiation, that we call, bending roots. The curly region is the transition zone of the root after observed at the cellular level. After exposed to enhanced UV-B radiation for 2 d (10.08 KJ/m2/d), cell size decreased and actin filaments gathered in wheat roots. We also find that H2O2 production increased and that content of the indole-3-acetic acid (IAA) increased remarkably. The pharmacological experiment revealed that actin filaments gathered and polymerized into bundles in the wheat root cells after irrigated H2O2 and IAA. These results indicated that actin filaments changed their distribution and formed the bending root, which was related to H2O2 production and increase in IAA. Overall, actin filaments in wheat root cells could be a subcellular target of UV-B radiation, and its disruption determines root morphology.(AU)
As plantas ajustam o crescimento da parte aérea para se adaptarem a fatores ambientais variáveis, como o aumento da radiação ultravioleta B (UVB). No entanto, as pessoas ignoram que as raízes das plantas também podem responder à luz UVB. Neste estudo, verificamos a morfologia das raízes enroladas de trigo sob radiação UVB, o que chamamos de raízes dobradas. A região encaracolada é a zona de transição da raiz no nível celular. Depois de exposição à radiação UVB aprimorada por 2 dias (10,08 KJ/m2/d), o tamanho das células diminuiu, e os filamentos de actina se reuniram. Também constatamos que a produção de H2O2 aumentou e que o conteúdo do ácido indol-3-acético (IAA) aumentou notavelmente. O experimento farmacológico revelou que os filamentos de actina se reuniram e polimerizaram em feixes nas células da raiz de trigo após irrigação com H2O2 e IAA. Esses resultados indicam que os filamentos de actina alteraram sua distribuição e formaram a raiz dobrada, relacionada à produção de H2O2 e ao aumento do IAA. No geral, os filamentos de actina nas células da raiz de trigo podem ser um alvo subcelular da radiação UVB, e sua interrupção determina a morfologia da raiz.(AU)
Assuntos
Triticum/efeitos da radiação , Raízes de Plantas/efeitos da radiação , Actinas , Raios Ultravioleta/efeitos adversosResumo
A routine check-up was performed on a captive 14-year-old female margay (Leopardus wiedii), a cutaneous mass was detected on the ventral thorax. The mass was surgically removed and sent for histopathological analysis. Histologically, the mass was a poorly-demarcated, highly cellular, infiltrative and unencapsulated mesenchymal neoplasm. Immunohistochemical labeling for smooth muscle actin and vimentin were positive, while desmin and cytokeratin were negative which is consistent with a myofibroblastic fibrosarcoma. This type of tumor has been diagnosed in wild felines, however this seems to be the first report of its occurrence in this L. wiedii. Wildlife oncology studies should be performed to promote our understanding of cancer in a species.
Assuntos
Animais , Actinas/análise , Fibrossarcoma/classificação , Fibrossarcoma/diagnóstico , Mariposas , Vimentina/análiseResumo
A routine check-up was performed on a captive 14-year-old female margay (Leopardus wiedii), a cutaneous mass was detected on the ventral thorax. The mass was surgically removed and sent for histopathological analysis. Histologically, the mass was a poorly-demarcated, highly cellular, infiltrative and unencapsulated mesenchymal neoplasm. Immunohistochemical labeling for smooth muscle actin and vimentin were positive, while desmin and cytokeratin were negative which is consistent with a myofibroblastic fibrosarcoma. This type of tumor has been diagnosed in wild felines, however this seems to be the first report of its occurrence in this L. wiedii. Wildlife oncology studies should be performed to promote our understanding of cancer in a species.(AU)
Assuntos
Animais , Mariposas , Fibrossarcoma/classificação , Fibrossarcoma/diagnóstico , Vimentina/análise , Actinas/análiseResumo
Cockatiels (Nymphicus hollandicus) are exotic birds thatoriginated from Australia.Because of their beauty and learning ability, they are one of the most popular pet birds among the Psittaciformes. The objective of this study was to report a case of leiomyosarcoma on the humeral musculature of the left wing of a cockatiel (Nymphicus hollandicus). The animal was admitted to the Wildlife Rehabilitation Center (NURFS-CETAS) of the Universidade Federal de Pelotas withswelling in the humeral region of the left wing. During surgery, the animal died and was transferred to the Laboratório Regional de Diagnóstico, Faculdade de Veterinária (LRD-UFPel). During histopathological evaluation (hematoxylin and eosin routine technique) of the tumor, spindle neoplastic cells were observed, arranged in interlaced bundles amongst degenerate and normal muscle fibers. Using immunohistochemistry, neoplastic cells were positively immunostained for vimentin and alpha smooth muscle actin. Based on of clinical-pathological and immunohistochemical findings, leiomyosarcoma was diagnosed.(AU)
As calopsitas (Nymphicus hollandicus) são aves exóticas originárias da Austrália. Devido a beleza e capacidade de aprendizado são uma das principais aves utilizadas como animal de companhia. O objetivo deste trabalho foi relatar um caso de leiomiossarcoma, na musculatura umeral da asa esquerda de uma calopsita. O animal deu entrada no Núcleo de Reabilitação da Fauna Silvestre (NURFS-CETAS) da Universidade Federal de Pelotas (UFPel), por apresentar aumento de volume na região umeral da asa esquerda. Durante o procedimento cirúrgico o animal veio a óbito, sendo encaminhado ao Laboratório Regional de Diagnóstico, Faculdade de Veterinária (LRD-UFPel). Na avaliação histopatológica (Técnica de rotina Hematoxilina e Eosina) da massa tumoral foram observadas células neoplásicas fusiformes, arranjadas em feixes entrelaçados, em meio a fibras musculares degeneradas e normais. Na imunohistoquímica verificou-se imunomarcação positiva das células neoplásicas para vimentina e alfa actina, de músculo liso. Diante dos achados clínico-patológicos e imunohistoquímicos determinou-se o diagnóstico de leiomiossarcoma. O diagnóstico definitivo deste neoplasma requer analise imunohistoquímica.(AU)
Assuntos
Animais , Leiomiossarcoma/patologia , Leiomiossarcoma/veterinária , Psittaciformes , Cacatuas , Actinas , Vimentina , Imuno-Histoquímica/veterináriaResumo
A endometrose é uma alteração degenerativa das glândulas uterinas e do estroma circundante, caracterizada pelo arranjo periglandular de miofibroblastos e pela deposição de matriz extracelular (ECM). O presente trabalho objetivou avaliar a expressão de colágenos tipos I, III e IV e α-actina de músculo liso (α-SMA) nas endometroses equinas, procurando esclarecer a participação dos miofibroblastos na progressão desses processos. Foram utilizadas 24 biópsias uterinas com diagnóstico de endometrose, recebidas pelo Serviço de Patologia Veterinária e de Reprodução Animal da FMVZ, Unesp, Botucatu, SP. Cortes histológicos foram submetidos às técnicas histoquímicas de tricrômico de Masson, picrosirius red sob luz polarizada e ácido periódico de Schiff (PAS) e imuno-histoquímicas para os três tipos de colágeno citados e α-SMA. Ainda, traçou-se um paralelo entre a técnica de picrosirius red e a imunomarcação dos colágenos tipos I e III. A análise histológica revelou que as fibras de colágeno denso correspondem ao colágeno tipo I, predominantes nas endometroses inativa e inativa destrutiva. As fibras de colágeno frouxo correspondem ao colágeno tipo III, predominantes nas endometroses ativas e ativas destrutivas. Nesses mesmos processos, a membrana basal revelou espessamento, aparentemente não relacionado ao colágeno tipo IV, e uma maior imunomarcação de miofibroblastos periglandulares em relação às endometroses inativa e inativa destrutiva. Dessa forma, nota-se que os miofibroblastos estão relacionados ao aumento na deposição de colágeno tipo III nos ninhos fibróticos ativos.(AU)
Endometriosis is a degenerative change of the uterine glands and surrounding stroma, characterized by periglandular arrangement of myofibroblasts and deposition of extracellular matrix (ECM). The aim of this study was to evaluate the expression of collagen type I, III and IV and α-smooth muscle actin (α-SMA) in equine endometriosis, and investigate the role of myofibroblasts in the progression of these processes. A parallel was made with histochemical techniques of Masson's trichrome, Picrosirius Red under polarized light and Periodic Acid-Schiff (PAS). Twenty four uterine biopsies received by the Veterinary Pathology Service and Animal Reproduction of FMVZ, UNESP, Botucatu, SP, were diagnosed with endometriosis. Histological analysis revealed that the orange dense collagen fibers correspond to type I collagen, being prevalent in inactive and inactive destructive endometriosis. The green loose collagen fibers correspond to type III collagen, and are predominant in active and active destructive endometriosis. In the same processes, a greater amount of periglandular myofibroblasts were observed in comparison to inactive and inactive destructive endometriosis. The presence of these cells in active processes are strongly related to an increased deposition of collagen type III in fibrotic nests. Regarding the basement membrane, the active destructive and active endometriosis shows thickening, apparently not related to an increase in expression of type IV collagen. The active destructive and inactive destructive endometriosis exhibited disruption areas in type IV collagen fibers. Thus, it is noted that the myofibroblasts are related to increased deposition of type III collagen in active fibrotic nests.(AU)
Assuntos
Animais , Feminino , Actinas/análise , Colágeno Tipo III/análise , Colágeno Tipo IV/análise , Colágeno Tipo I/análise , Endometriose/fisiopatologia , Cavalos , Miofibroblastos , Imuno-Histoquímica/veterináriaResumo
A endometrose é uma alteração degenerativa das glândulas uterinas e do estroma circundante, caracterizada pelo arranjo periglandular de miofibroblastos e pela deposição de matriz extracelular (ECM). O presente trabalho objetivou avaliar a expressão de colágenos tipos I, III e IV e α-actina de músculo liso (α-SMA) nas endometroses equinas, procurando esclarecer a participação dos miofibroblastos na progressão desses processos. Foram utilizadas 24 biópsias uterinas com diagnóstico de endometrose, recebidas pelo Serviço de Patologia Veterinária e de Reprodução Animal da FMVZ, Unesp, Botucatu, SP. Cortes histológicos foram submetidos às técnicas histoquímicas de tricrômico de Masson, picrosirius red sob luz polarizada e ácido periódico de Schiff (PAS) e imuno-histoquímicas para os três tipos de colágeno citados e α-SMA. Ainda, traçou-se um paralelo entre a técnica de picrosirius red e a imunomarcação dos colágenos tipos I e III. A análise histológica revelou que as fibras de colágeno denso correspondem ao colágeno tipo I, predominantes nas endometroses inativa e inativa destrutiva. As fibras de colágeno frouxo correspondem ao colágeno tipo III, predominantes nas endometroses ativas e ativas destrutivas. Nesses mesmos processos, a membrana basal revelou espessamento, aparentemente não relacionado ao colágeno tipo IV, e uma maior imunomarcação de miofibroblastos periglandulares em relação às endometroses inativa e inativa destrutiva. Dessa forma, nota-se que os miofibroblastos estão relacionados ao aumento na deposição de colágeno tipo III nos ninhos fibróticos ativos.(AU)
Endometriosis is a degenerative change of the uterine glands and surrounding stroma, characterized by periglandular arrangement of myofibroblasts and deposition of extracellular matrix (ECM). The aim of this study was to evaluate the expression of collagen type I, III and IV and α-smooth muscle actin (α-SMA) in equine endometriosis, and investigate the role of myofibroblasts in the progression of these processes. A parallel was made with histochemical techniques of Masson's trichrome, Picrosirius Red under polarized light and Periodic Acid-Schiff (PAS). Twenty four uterine biopsies received by the Veterinary Pathology Service and Animal Reproduction of FMVZ, UNESP, Botucatu, SP, were diagnosed with endometriosis. Histological analysis revealed that the orange dense collagen fibers correspond to type I collagen, being prevalent in inactive and inactive destructive endometriosis. The green loose collagen fibers correspond to type III collagen, and are predominant in active and active destructive endometriosis. In the same processes, a greater amount of periglandular myofibroblasts were observed in comparison to inactive and inactive destructive endometriosis. The presence of these cells in active processes are strongly related to an increased deposition of collagen type III in fibrotic nests. Regarding the basement membrane, the active destructive and active endometriosis shows thickening, apparently not related to an increase in expression of type IV collagen. The active destructive and inactive destructive endometriosis exhibited disruption areas in type IV collagen fibers. Thus, it is noted that the myofibroblasts are related to increased deposition of type III collagen in active fibrotic nests.(AU)
Assuntos
Animais , Feminino , Actinas/análise , Colágeno Tipo III/análise , Colágeno Tipo IV/análise , Colágeno Tipo I/análise , Endometriose/fisiopatologia , Cavalos , Miofibroblastos , Imuno-Histoquímica/veterináriaResumo
Background: Mammary remodeling is determined by a combination of cell differentiation, proliferation and programmeddeath controlled not only by systemic hormones, but also by proteins produced either in the stromal or in the epithelialcompartments. However, few works were undertaken to use phenotypic markers for cellular components of the lactatingcaprine mammary gland and to determine structuralfunctional relationships. Thus, the aim of this research was to evaluate the morphology and α-SMA, F-actin and JC1 protein expression in the mammary gland of Canindé goats in earlyhormonal lactation.Materials, Methods & Results: Fourteen 2 years old female Canindé goats were used and distributed into two groups: nonlactating (n = 4) and lactating animals (n = 10). Lactation was induced by using estrogen, progesterone and prednisoloneaccording to previous protocol. All subjects were housed indoors and had four hours of daily access to solarium. Mammarygland biopsies were obtained at days 5 (D5) and 26 (D26) of the early stage of lactation and were assessed by histologicaland immunohistochemical analysis. The microstructure of mammary gland in lactating goats was analyzed by conventionalhistologic techniques. Immunohistochemistry was used by identify α-SMA in myoepithelial cells and JC1 in epithelialcells. α-SMA and F-actin expression were assessed by confocal microscopy. Concerning microscopic features, the alveolistructure was evaluated in respect to number, size and cell population. The structural units of the lactating mammary glandconsisted of variably shaped lobules. When comparing to lactating tissue, sections of the non-lactating mammary glandshowed a lower number and size of alveoli, separated by wide connective tissue. Lactating tissues demonstrated numerousand well-developed alveoli, separated by thin trabeculae of connective tissue. In relation to lactating goats, no difference (P> 0.05)...(AU)
Assuntos
Animais , Feminino , Actinas/análise , Glândulas Mamárias Animais/fisiologia , Células Epiteliais , Proteína Quinase 1 Ativada por Mitógeno , CabrasResumo
Background: Mammary remodeling is determined by a combination of cell differentiation, proliferation and programmeddeath controlled not only by systemic hormones, but also by proteins produced either in the stromal or in the epithelialcompartments. However, few works were undertaken to use phenotypic markers for cellular components of the lactatingcaprine mammary gland and to determine structuralfunctional relationships. Thus, the aim of this research was to evaluate the morphology and α-SMA, F-actin and JC1 protein expression in the mammary gland of Canindé goats in earlyhormonal lactation.Materials, Methods & Results: Fourteen 2 years old female Canindé goats were used and distributed into two groups: nonlactating (n = 4) and lactating animals (n = 10). Lactation was induced by using estrogen, progesterone and prednisoloneaccording to previous protocol. All subjects were housed indoors and had four hours of daily access to solarium. Mammarygland biopsies were obtained at days 5 (D5) and 26 (D26) of the early stage of lactation and were assessed by histologicaland immunohistochemical analysis. The microstructure of mammary gland in lactating goats was analyzed by conventionalhistologic techniques. Immunohistochemistry was used by identify α-SMA in myoepithelial cells and JC1 in epithelialcells. α-SMA and F-actin expression were assessed by confocal microscopy. Concerning microscopic features, the alveolistructure was evaluated in respect to number, size and cell population. The structural units of the lactating mammary glandconsisted of variably shaped lobules. When comparing to lactating tissue, sections of the non-lactating mammary glandshowed a lower number and size of alveoli, separated by wide connective tissue. Lactating tissues demonstrated numerousand well-developed alveoli, separated by thin trabeculae of connective tissue. In relation to lactating goats, no difference (P> 0.05)...
Assuntos
Feminino , Animais , Actinas/análise , Cabras , Células Epiteliais , Glândulas Mamárias Animais/fisiologia , Proteína Quinase 1 Ativada por MitógenoResumo
To date, no investigations have been found about the isolation and in vitro cell culture characteruization of Wharton's jelly mesenchymal cells (WJMC) from caprine umbilical cord (CUC). Therefore, in the present experiment the isolation protocol and growth kinetic of CUC matrix cells were studied CUC were collected from an abattoir and pregnant uteri (lategestation) and their Wharton's jellies (WJ) were cut into 2 x 2 mm² fragments for explanting. Explants (n=8-10) were transferred to each 35 mm culture dish. WJ explants were removed 5 days after plating and the remaining adherent cells were immunostained for Actin protein and histochemically were assayed for the presence of alkaline phosphatase (AP) activity. Besides, in this study growth kinetic aand clonogenicity were evaluated for the isolated cells. CUC isolated cells displayed spindle-form and small round-shape with large nucleus. Confluent cells formed colonies that oresented AP activity. Immunocytochemical analysis reveated expression of Actin protein. Initial seeding concentration of 2 x 10 cells resulted in smaller time for doubling the population compared to fetal fibroblasts (46.6 vs. 54.3 h respectively). In conclusion, WJ of CUC contains an easily isolated and rich source of myofibroblast-like cells which exhibit some stem cell-like properties.(AU)
Assuntos
Humanos , Animais , Cordão Umbilical/anatomia & histologia , Células-Tronco Mesenquimais/citologia , Actinas/análise , Cabras/classificação , Monoéster Fosfórico HidrolasesResumo
To date, no investigations have been found about the isolation and in vitro cell culture characteruization of Wharton's jelly mesenchymal cells (WJMC) from caprine umbilical cord (CUC). Therefore, in the present experiment the isolation protocol and growth kinetic of CUC matrix cells were studied CUC were collected from an abattoir and pregnant uteri (lategestation) and their Wharton's jellies (WJ) were cut into 2 x 2 mm² fragments for explanting. Explants (n=8-10) were transferred to each 35 mm culture dish. WJ explants were removed 5 days after plating and the remaining adherent cells were immunostained for Actin protein and histochemically were assayed for the presence of alkaline phosphatase (AP) activity. Besides, in this study growth kinetic aand clonogenicity were evaluated for the isolated cells. CUC isolated cells displayed spindle-form and small round-shape with large nucleus. Confluent cells formed colonies that oresented AP activity. Immunocytochemical analysis reveated expression of Actin protein. Initial seeding concentration of 2 x 10 cells resulted in smaller time for doubling the population compared to fetal fibroblasts (46.6 vs. 54.3 h respectively). In conclusion, WJ of CUC contains an easily isolated and rich source of myofibroblast-like cells which exhibit some stem cell-like properties.
Assuntos
Humanos , Animais , Actinas/análise , Cordão Umbilical/anatomia & histologia , Células-Tronco Mesenquimais/citologia , Cabras/classificação , Monoéster Fosfórico HidrolasesResumo
A cicatrização é um fenômeno complexo que restabelece a integridade morfológica e funcional de qualquer tecido ou órgão lesado. A reconstituição consiste numa perfeita e ordenada cascata de eventos celulares e moleculares que interagem para que ocorra a recomposição do tecido. Os fibroblastos são as principais células envolvidas na cicatrização e têm por principal função a manutenção da integridade do tecido conjuntivo, pela síntese dos componentes da matriz extracelular. Os miofibroblastos são componentes importantes durante a reparação do tecido lesionado e aparecem após o término dos fenômenos inflamatórios iniciais. Miofibroblastos expressando α-actina de músculo liso (α-SMA) não só promovem a contração, mas também sintetizam níveis elevados de proteases degradantes da matriz extracelular.(AU)
The healing is a complex phenomenon which restores the morphological and functional integrity of any tissue or organ injured. The recovery is a perfect and orderly cascade of cellular and molecular events that interact to have the rebuilding of tissue. The fibroblasts are the main cells involved in wound healing and have the main function to maintain the integrity of the tissue, the synthesis of components of extracellular matrix. The myofibroblasts are important components for the repair of injured tissue and appear after the end of the initial inflammatory phenomena. Myofibroblasts expressing α-actin of smooth muscle (α-SMA) to promote not only contraction but also synthesize high levels of proteases degrading the extracellular matrix.(AU)
La cicatrización es un fenómeno complejo que restaura la integridad morfológica y funcional de cualquier tejido u órgano lesionado. La reconstituición es una cascada perfecta y ordenada de eventos celulares y moleculares que interactúan para producir la reconstrucción del tejido. Los fibroblastos son las principales células implicadas en la cicatrización y su función primordial es de mantener la integridad del tejido conjuntivo, la síntesis de los componentes de la matriz extracelular. Los miofibroblastos son componentes importantes en la reparación del tejido dañado y aparecen después del final de los fenómenos inflamatorios iniciales. Los miofibroblastos expresando α-actina del músculo liso (α-SMA), que promueven no sólo la contracción, sino también una síntesis de altos niveles de proteasas degradantes de la matriz extracelular. (AU)
Assuntos
Humanos , Animais , Fibroblastos/metabolismo , Cicatrização/fisiologia , Matriz Extracelular/metabolismo , Actinas/análise , Células Endoteliais/metabolismoResumo
A cicatrização é um fenômeno complexo que restabelece a integridade morfológica e funcional de qualquer tecido ou órgão lesado. A reconstituição consiste numa perfeita e ordenada cascata de eventos celulares e moleculares que interagem para que ocorra a recomposição do tecido. Os fibroblastos são as principais células envolvidas na cicatrização e têm por principal função a manutenção da integridade do tecido conjuntivo, pela síntese dos componentes da matriz extracelular. Os miofibroblastos são componentes importantes durante a reparação do tecido lesionado e aparecem após o término dos fenômenos inflamatórios iniciais. Miofibroblastos expressando α-actina de músculo liso (α-SMA) não só promovem a contração, mas também sintetizam níveis elevados de proteases degradantes da matriz extracelular.
The healing is a complex phenomenon which restores the morphological and functional integrity of any tissue or organ injured. The recovery is a perfect and orderly cascade of cellular and molecular events that interact to have the rebuilding of tissue. The fibroblasts are the main cells involved in wound healing and have the main function to maintain the integrity of the tissue, the synthesis of components of extracellular matrix. The myofibroblasts are important components for the repair of injured tissue and appear after the end of the initial inflammatory phenomena. Myofibroblasts expressing α-actin of smooth muscle (α-SMA) to promote not only contraction but also synthesize high levels of proteases degrading the extracellular matrix.
La cicatrización es un fenómeno complejo que restaura la integridad morfológica y funcional de cualquier tejido u órgano lesionado. La reconstituición es una cascada perfecta y ordenada de eventos celulares y moleculares que interactúan para producir la reconstrucción del tejido. Los fibroblastos son las principales células implicadas en la cicatrización y su función primordial es de mantener la integridad del tejido conjuntivo, la síntesis de los componentes de la matriz extracelular. Los miofibroblastos son componentes importantes en la reparación del tejido dañado y aparecen después del final de los fenómenos inflamatorios iniciales. Los miofibroblastos expresando α-actina del músculo liso (α-SMA), que promueven no sólo la contracción, sino también una síntesis de altos niveles de proteasas degradantes de la matriz extracelular.